405331domain: NAppears in sequencesa(n) = numerator of sum of the reciprocals of all terms in rows 1 through n of table A126336.at n=8A126338Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 3,2 4,2 4,3 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155378